Territory



(No Model.)

H. P. HEAGOGK.

SAW MILL.

Patented Dec. 25, 1888.

@Mmi

Ian. O. (2.

UNITED STATES PATENT FFICE.

HOIYARD P. HEACOCK, OF MISSOULA, MONTANA TERRITORY.

SAW-MILL.

SPECIFICATION forming part of Letters Patent NO. 395,051, dated December 25, 1888.

Application filed June 25, 1888. Serial No. 278,200. (No model.)

To all whom it may concern.-

Be it known that I, HOWARD P. HEACOCK, of Missoula, Missoula county, Montana Territory, have invented certain new and useful Improvements in Saw-Mills, of which the following is a specification.

My invention relates to the frictional type of feed-works in which the rate of feed is not positive, but may be varied indefinitely within the limits of its range to suit the work in progress.

My invention is intended to increase the duraliiility and simplicity of the feed-works and to add to the range of variation in the rate of feed.

Myinvention consists in the parts and coinbinations hereinafter described and claimed.

In the accompanying drawings, Figure 1 is a plan view, and Fig. 2 a vertical section on line 50, Fig. 1,0f my improved feed-works and so much of a saw-mill as is needed to show the connection of thefeed-works thereto.

2 is the saw-arborfi being the saw.

4 and 5 are pulleys fast upon the arbor Upon a suitable frame-work is mounted shaft, 6, on which are secured the pulleys and 9.

is the feed-shaft, having upon its end the feed-pinion 11, which gears into the racks of the log-carriage. The carriage is not shown, as its construction may be of any well-known sort, the present invention not being @011- cerned therewith. Upon the shaft 10 are pulleys l2 and 13, pulley 12 being in line with pulley4 on the sawarbor and pulley 13 being in line with pulley 9. Pulleys 5 and T are also in line with each other. Open belts 14 and 15 connect pulleys 4 to 12 and 9 to 13, and a crossed belt, 16, connects pulleys 5 and '7.

The belts 14 and 15 are loose and the pulleys upon which they run are flanged in order to prevent them from slipping off. A frame,

' 17, is pivoted at 18 and carries pulleys 19 and 20, which are alternately brought into contact with the belts 14 and 15, respectively,\vl1en the frame is tilted one way or the other, as by the lever 8.

The operation is as follows: Supposing the carriage to be drawn back and the log to be in position before the saw, the tilting of the frame 17 so as to bring the pulley 19 against the belt 15 will thereby tighten the same, so

ener made to work thereon.

that it will drive pulley 13 and pinion 11 in the direction indicated by the arrow and feed the log to the saw, the rate of feed being determined by the amount of pressure brought upon the belt 15 by the sawyer. The belt 14 is at this time hanging loosely from pulleys 4 and 12 and the friction between them is inappreciable in practice. To back up the carriage or gig-back, the frame 17 is tilted in the reverse direction, the belt 14 being thereby tightened and the motioirgf. shaft 10 and pinion 11 reversed. The maximum speed both in feeding and gigging back must of course be a variable quantity, depending upon the character of the machinery and the work to be done; but I find it possible to provide a much higher maximum feed than is practica ble with the usual friction-feed, as much as an eighteen-inch feed being successfully used.

The reason is partly, at least, that the feeding power is derived from large surface-contacts between belts and pulleys, and hence is large without excessive pressure existing between any parts. Hence, also, the apparatus is very durable.

I have described the belts l4 and 15 as being open and the belt 16 as being crossed; but I do not wish to be confined to that arrangement, as one of the belts 14 or 15 might be crossed, suitable changes being made in the other parts of the apparatus to correspond, so that the log-carriage would be fed in the right direction. As the tightener would not work well on a crossed belt, however, the arrangement shown is preferred, unless the belt 16 was made one of the loose belts and the tight- Other modes of securing the reverse motion of belts 14 and 15 might be devised, while the essential features 1 of my invention were retainedto Wit, the

two loose belts adapted to drive the feed-' works in opposite directions and alternately acted upon by the tightener.

1 claim- 1. The combination, in a saw-mill, of a pulley upon the saw-shaft, a belt leading from said pulley to a pulley on the feed-shaft, a second pulley on the saw-shaft and a belt thereon leading to a counter-shaft, and a belt leading from said counter-shaft to a second pulley on the feed-shaft and running the opposite direction from the first-named belt, two of said bells being louse and combined with a l 12 and 1:],Dl0lllll1ell upon a shaft 01' the feedtig'htener which acts alternately OllSflld. loose Works, pulleys 7 and 9 upon shaft (1, pulleys belts. c and 0n saw-shaft i, belt 10 from pulley 5 2. The combination, in a saw-mill, of two p ulleys, as 12 and 13, upon a feed-shaft, as .1 0, two j ley 13,21110 loose belt ll ll-em pulley -l 10 pulloose bellsms lla nd15,11p011Sai1l pulleysmul l 103 1;, null a lighl'ener :ulalplm'l l0 lig'lllen driven in )()Sll'( (lll'CCllOllS, and a lightener, l bells 'H- and '15 nll'cuiimlely.

as 17, adapted l0 tighten allermltely (me 01' .llOWARl) l. IIEAUKIK. the other 01' will hell's, suhslmllially as 00- \Viluesses: 1o scribed. J. I. VEEDER,

2-3. The (filgdllllllflllllll, inasmv-mill,el'pulleys l I. ll. 'l. MASQN.

to pulley 7, loose belt '15 from pulleyll l0 pul- 15 

